38g lighter and more compact than the Sony 50mm f/1.2 GM (Sigma weights 740g and the Sony 778g)
The size and chassis is about the same of that of the Sigma 50mm f/1.4.
72mm filter size
The lens aperture has 13 blades (50mm f1.2 GM got 11 only)
More affordable than the Sony
Comes for Sony E and Leica L
Announcement on March 26 at 21 Tokyo time (that’s 13:00 in Berlin and 8:0 New York time)